In 1995, M&S asked for repayment of all the VAT, £3.5m, they had been wrongly charged. The Commissioners said, no, you passed the cost onto the customers so we're only giving you the VAT on your profit: £350,000.
Ten years on, the case still continues... and is heading off to the European Court of Justice.
I wonder what the total in legal fees will be?
... and if you've got a receipt for M&S tea cakes between 1973 and 1994, I'd ask for a refund of the excess money you were charged.